drop unused imports

Author: mohawk2

lib/PDL/Graphics/TriD/GL.pm

@@ -652,11 +652,6 @@ sub read_picture {
 
 package PDL::Graphics::TriD::EventHandler;
 
-use OpenGL qw(
-  ConfigureNotify MotionNotify DestroyNotify
-  ButtonPress ButtonRelease Button1Mask Button2Mask Button3Mask Button4Mask
-);
-
 use fields qw/X Y Buttons VP/;
 sub new {
   my $class = shift;
@@ -760,8 +755,6 @@ sub do_perspective {
 
 package PDL::Graphics::TriD::GL;
 
-use OpenGL ();
-
 use strict;
 use warnings;
 use PDL::Graphics::TriD::Window qw();